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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29aab267dc731c0c9ecd553b4c4f50b0bd80cd6ca6d82a25cfc201f45fb2c0cc' 
  AND token = 'ri+/bwUW7lKFvG/3WOzVo7jc/H5kzV7H5sloHyXayb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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