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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a2b35f6eb53f6a63403ea87eabfccbed53ba27bd26dafbb3bf5c8b55bffff4' 
  AND token = '1huGO8w1JEVcd67h+KcvbhkAqcP5I1ZqYOTXm6IqlNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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