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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9833feea66485b39d3f41732ad57193f1ff5cacb6574f11f61ba60ee619c4f1d' 
  AND token = 'Zdr21Tj36iEbam61pPMZWEQnD4qG2P9BCErbKjvEilg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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