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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba58e6339413099364800c75ca71d7923c60775ab2e496e467a1dd11c0c8f5d' 
  AND token = 'SCGgCZD/baIkx51t/kfboIBjqoAoMHvFiyg1Yv0QEgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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