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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef569fc5b9e9a899dc1fc6bddc1956b76a0b6b6a4c7dbd0772e10b3fbf31742b' 
  AND token = '7KURouGSg67s1TAAcHMZkFaHV4W5b9AF9ERjVkbdrqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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