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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960ee1c60aa68c219c73a869965f4cc61c8d6be3891318c82a74dcd33bdaaa0c' 
  AND token = 'VsIRfzXvzqkQ/gdNKAeEgV84utqgcaVRiQ8Z02yd87U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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