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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36f8aa9caac54d20d9d689abb15ed7d8f9867db3c32d2fdeee01a14dc806d69' 
  AND token = 'cNSC5MEqIwkt7ljoPpThhNdqJOtchJVvbBPprYibBJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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