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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2aea03b5e0ca631654e557bcd6f5b5299d81c9a1cedd7e932a059db9b82d82a' 
  AND token = '/9LD5ZLozH4xc6GduukVhMXi098/bEDqcxFQGNLITdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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