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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf48b141b8a37e3d29d24852e03f29ab00fc5112aafef36cc391e37215fca9eb' 
  AND token = 'qUUbPE3wEit2cpXt30sY1nq/cqCxKarZo779iiOdhbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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