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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2e071617a7d8497f3c65830d1165edee1f4a8a79c4df0dc7fc9ccb2141bff3' 
  AND token = 'rloHUZnThhUC6HxyNRaMmfC5nUBKkWFZ58gF4ouHAH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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