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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f177f684b7b7bd4ff1324071bd99a3cef24ce280b7220bcde08a3339ec82c7' 
  AND token = '5bo+fsmIlWjMsJb+W5uinIwlm32uUL0+FfO0r7dIEIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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