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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0363be48066fa3baaf7dab6158bb0ab58308e7c94b568678698165464762251c' 
  AND token = 'FizRuuXJTehE5HVek2mmzdc4cycIqBpOt9O/d/XAYSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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