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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92529ed9beaeac4b70a7d83527347c9e72239a28c7df383a9d301baf8ae6a744' 
  AND token = 'rWR58wZl5yyiNgJwmnuGgyOzg9Oqb60yJyARe8YM360=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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