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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dcaafceeb2734297f4c3917bb84e959b6250616e5a2adab3bede11aafcba2f6' 
  AND token = 's9FB63Z2mNQ7jfQE/41w5+cmdFP5eIkzqZs6diCi/PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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