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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2947d821616622681b7436b1fe28fbec660c4377282658632dd8e9644992cc8' 
  AND token = 'JOrTYwPEkk0aYLsCZsT4X0ufL+s7O+CIJYpzZKy05oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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