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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd990d20337b7a86c8cf2684950b5e61195dd1e1ecf9726fda00990ee7663a4' 
  AND token = 'BTv/9CZX92nASH8Pmej3Glfjq5wu9Vlo0+1X9kNeq3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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