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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993adfb60020eda20c2c573e2a2b6244a3263814cebd34ae307bf11aec540a27' 
  AND token = 'pdwEbNn3BN42K/v4bZhiYZpuvZtLOBjDON3uhuegHSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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