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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0fcebdd8d5e1e89c31ecdd2dffd3faad159f942c00073425c4cb522e5918ba' 
  AND token = 'Oek4gXm60z3FeyoVOwzuqZq6f99BuD74lTKcGhx0luw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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