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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f658fbeb5c299a6ef68918f8b410e2886f78a35835d76aa56a68e64aa32c322' 
  AND token = 'B2YKVx2g9mRcVDtyiO4dJ84XYnZ6OjfiHFMIY2URuVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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