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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ac0d928dcab88ae49bbdc2823fc9a132b2d8b8ccb2ceb2a36f098c47c70b2d' 
  AND token = 'pNHgsthyk4xTRNlyp/nnnpd/RL9si7/TmKXJI3q7aNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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