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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc2ee958cc1c6b187177e4069e722af59a249dbddff13309d7a29e8f15c2c52' 
  AND token = 'YgJ8wrJyc93yx1L33RuuykWJ5pyNrFcJdwzRf2ITHE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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