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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c08e43f0eb58afa4e8d4ce4e8cb6ddc7002e1578dd63b2cf57e2014e247ae58' 
  AND token = 'FtZJisRbiewiW2bkJIPZ5ZsC5z408miQeYuxbmqWDsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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