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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccaff97a4360192dd6ca738a37b51f2c6a030b0d4f6a91b9471cc29ee857c99e' 
  AND token = 'U2jNI2iZjv4crU3ZTYmQ1wfMFxZKSkitWQRA+P2Ipis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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