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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605d5f138e73f8e3ada71ac64c77fcff85ef256c1e4f94658bd81fefbb4d49c3' 
  AND token = '8///tQJ3BilzXm+gHgDtm13XNtvvZ3sgwuMfeEX1fF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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