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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716686cb8f1cdf026ae82e3dc9c53b86b08cdf779dd91fbb4398f2de50c07312' 
  AND token = 'f5hL7E6tv6CiSUg99u2Z5yPaNuc1Qk67EXlpYRZhN44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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