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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7315247e140d6dab094f26843232f86ac157217a2460f65f81ca81f3a5f33589' 
  AND token = '3wmz8Q2B7hBc1Rf6Jr2osLkjRvtbqb2tn5PgDtih5jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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