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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6015372d098a9915c1e7ad20ceac5b6fea7fdeafca85d67374dfce0995d711bc' 
  AND token = '1kO9nBuD+hqaYOu73kH2dJcdVQVPX/S2WZuelQaYoh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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