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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c2d9a1b565494df6aeeeef7bacb0c56c719bfe3aecadd23381730a3a0e250f4' 
  AND token = '0ib7R39wheOAvahANDpp6ozFtWnysdZ6K5wBD1yRI9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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