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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3385556ec2677a74b574ccc625335439484e0efb7c9130691e3c35fb6a86e92d' 
  AND token = 'QVuN65sBVzQa5spqc2ybMkNJ9yGpzyY7H4hZBg9BCQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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