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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81e568c0b92a9447601410cec7f82b1764386dcfa3b9a2665abbdc17d8b64e6e' 
  AND token = 'whdVoXKJMg5YM1qRFlQekyPEdK/ORRLMKkeVzzIqJD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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