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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8c2c3b8ef603828877575642a64015bf5387518230173a680d4493cb85c7ff' 
  AND token = 'Pt2ZSSuuo0TPOm9UrY+ItSryPmXJ9w9Jp3krNgwIAmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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