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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716a673ff66c62bb7a2a27ef1c8e9f4650e20072b7cd0bc848281fe8b8af77dd' 
  AND token = 'rpoX+L7AmOR3iVGS2wwzgx3CZtIa3Y9d5KXWnviFLCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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