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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97abdd8cc0bd564e2ab39565942f4077ef18153438118f58b860ec7f7bb4f5b5' 
  AND token = 'L8PHfDDLscN1WtcZq9wtSq66S0R5xRugHS0VoGKH0zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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