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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6910a56d96cd0acc6cbdf210e207f2991fd0087070e6ccbf1d4f9b32fe26ee48' 
  AND token = 'UfH980Va2tsNZekPAxNZeA19JDBZcCFt2aC8flz5ND0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00212

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}