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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b96675f0b5ff42d44d2904b7631dd8a08af276e4dbcc956fd3ab7471322cc5' 
  AND token = 'S9ULbR4HnsKOISnmGJd6uUdmVCLEC/m3Ht93Z9XOnIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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