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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71ff8c56a310323d6391cb940cdf6775f5566463e31dc06c8f1d4ad0b1941b0' 
  AND token = 'CSxPbEa0OvL86UgLK3hpb7j6aJrSBK1kI+QxeXAUsjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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