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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da98e2353ac064406f7e7ba88addd5deea6a31f46dc221832b8ca0c76ef819ce' 
  AND token = 'FYdWAJ6icYGJh8hEh9SvJmeYle7gcPr7sc4e6YY5Oag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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