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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab008c92df8d16ed30ddb2294187292f9ad69147d38129583e1eb6bd64a1260a' 
  AND token = 'ua8JrXOu1kp01jRYDLfOTE0sdhWm+6sLQP6lNpp4WGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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