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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb15c852fe7b565eadf8b0a3e1098502c7914ee4df3551266ece2dde46e2cc9' 
  AND token = 'HB9Kb22m97GgsqDX4mo0l9MZ4FlP9mKaOkjGwjUwLtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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