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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e1b46d0382909ddd94e0aa88b537c73300336aee19f50a7b9b6535d4b72e19d' 
  AND token = 'M7JuYEDfLiVrDfBLRkovGEPSRRa6Aqb5yjnJy6KbB/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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