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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d668d803816aec80c37a8510acc007f9f0a932e9826f40d28ead10cef80eb2' 
  AND token = '1zPfmhO7dPasx3EzgFAU9B70CbRTFfSKYQuo/Rgu7lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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