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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055141364b3a8289a1bc53ea568e4259bf4ccfc1ecc2d3b3e8fb1ba45cea933f' 
  AND token = 'fxjb70Q7pGdGbnop0k6/b1Z60i+v2mv/kqeN3HQwJoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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