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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7912b131a75eb0aac7b32d654605a53145bbd29eacdf5a68d8f5279a010b4e33' 
  AND token = 'K9kDp0E3ynqG2jKB5kIHzG+x+oI+t1qSIOOVj8u7mc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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