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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8308f8690e37c439b16a16203d2f7bb9703a01247721472a55c499f42e51c711' 
  AND token = 'oeYVHQDdAqYg0ryUX1y1DMrPkIWiEHfE0lde0Wd1HWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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