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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc5aec555f6391ed8223cd887396e9a518717919c276ed8ce9774942b65bb8a' 
  AND token = '7f9pRqxSbfquvI4E6D7zg2SUzTWJovz2BZEq5E+neyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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