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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81dd63009702baded241a76576b2f0f3e250a20fe66635eb987559015c80f88' 
  AND token = '92ZbdfCv+G0E3NSopNPRSqS0fiAMdlQeB0XbcvkLd9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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