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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3847d99606dfca14779b5b359329ad1cd4895e5f232686e9f75f5e9ab9b5ce' 
  AND token = 'bQfWFwlomsoMtHy/6o5xpB6hpv1XGsp0MGH6f8aiLPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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