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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e1cfbb1266304a2d1a37c62900ec6bca06ec5f84697ccdefa54639c2d54540' 
  AND token = 'FqkYGv2j9jWw9coCm+C6VyO8VE0vzEDCtD/jnAKVarE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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