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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e022a6b6ac5c511e6839581f37907ced972bd2568a73f286e997ee2f0f3af6' 
  AND token = 'vOYV/VO/shf5qh5tE89RHaFg0RFJbKezkNZMdowpb8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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