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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79194167dd37db92a9236b90b3a2d212c2cd7f92991056a9fceb1c5e68efa4a' 
  AND token = '+QgJy4cyL31knGolryE+MSF7PuSIQ4iJTjeyH7CDZNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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