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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7597e1843135b9b9a8b3d74b6cdd0b79f5c227e139afe17df376e28c539c81ec' 
  AND token = 'Fnr8JgO3sn13rv7xh2X1e6nP0dGuK17Y7TDx0dPn7l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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