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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd9ebb87ef2c62daa4711cd129b1307a24d4edb491ad6fab3e4f074822f1b0c' 
  AND token = 'AiWUGaswq63keoFwroHKFwi4yTHMpJsrDqCCTomCnRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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