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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9b1fdd3eb02119a55490526748565844e2e186d8b895f17b71834ad659ab8c' 
  AND token = 'hEHbrfJxDrkWQ+uuYqI9Y7AKoD2Jd4os2Ki3R3ceIIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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