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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f2f25a04720eadf5a42345a62c56945cde7f814f8194ff6ff9c1f101918bd4' 
  AND token = 'B0MybH7ziXmry2VuT3E3EIjqSnTfnOI/JuRKLUi7vW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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